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Vesa Puttonen's new book reveals: These investment traps are eating your returns – here's how to avoid the most common mistakes

Finance ✍️ Matti Virtanen 🕒 2026-03-13 06:43 🔥 Views: 1
Vesa Puttonen's new book for investors

Professor of Finance at Aalto University, Vesa Puttonen, has done it again. He has released a new work that holds up a mirror for every investor. The book, titled "Navigating the Investment Minefield: A Practical Guide to Avoiding Mistakes, Biases, and Traps," reads like a survival guide for the minefield of financial markets – a place where, at some point, we all step wrong.

There's an old saying on Bay Street: the market is driven by two emotions, fear and greed. But Puttonen doesn't stop there; he digs deeper into the labyrinths of the human mind. According to him, most investment mistakes aren't due to a lack of information, but how we process it. It's about psychology.

The three biggest traps investors fall into

I went through the key takeaways from Puttonen's book, and they boil down to a few recurring themes. He doesn't point fingers; instead, he opens your eyes to how our own brains fail us precisely when money is on the line. Here they are – the traps we've all likely stumbled into at some point:

  • Home bias. We prefer to invest in familiar companies, even when the world is full of opportunities. A Canadian might buy shares in a local pipeline company despite analyst warnings. Familiarity feels safe, but it eats away at returns.
  • Anchoring. Remember the price you paid for that stock? That's now your anchor. Even if the company's future looks bleak, you cling to that purchase price and refuse to sell at a loss. Puttonen reminds us that past prices are irrelevant – only the future matters.
  • Overconfidence. After a few successful trades, we start thinking we're geniuses. This leads to taking on more risk and forgetting about diversification. And then comes the day the market reminds you who's really in charge.

However, Puttonen's book doesn't just stop at listing problems. Above all, it's a practical guide on how to dodge these psychological landmines. For instance, he suggests keeping an investment journal: jot down why you bought a stock, and revisit it a year later. It will mercilessly reveal whether your decision was based on analysis or emotion.

The book's release has sparked discussion in financial circles. One portfolio manager noted privately that this book should be required reading in every introductory finance course. Another, a seasoned investor, commented that they could have avoided tens of thousands of dollars in losses if they had read this twenty years ago.

"Navigating the Investment Minefield" isn't your typical investment guide that tells you where to put your money. It's far more valuable: it tells you where not to put your money, and more importantly, why we so often make the wrong choices. Ultimately, it's about the fact that an investor's worst enemy isn't market volatility or even high inflation – it's the person staring back at you from the mirror.